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From: Baumgart, James (no email)
Date: Mon Jun 05 2006 - 12:54:04 EDT
Many boats hit something unknown and suffer damage. It doesn't matter
if it's a container, tree, oil drum, flotsam, submarine, whale, or a
rock or reef. They usually never know what it was. The point should be
that a world cruising boat is equipped with the materials to make a
collision mat, do emergency repairs at sea, have under water epoxy,
plenty of pumps, and should have a protected underbody (skeg hung rudder
at least) for protection. I wouldn't sail without a fishfinder (simple
sonar). I do sail without radar but then I don't have much fog around
here and I know my way around local waters at night. On my long voyage,
I did have radar. Forward looking and side scanning sonars will
probably one day come down in price and be common place. These are more
for fishing than for collision avoidance however I suppose every little
bit could help. I'd equip myself with a damage kit and go without.
It is possible for items to float at different levels. Sea water
density varies with depth, salinity and temperature. A submarine
adjusts its density (specific gravity) to hover at various depths.
Cruising through the thermocline can cause rapid movement upwards or
downwards.
Ever seen one of those Galileo thermometers where there are bulbs
floating at various levels in a cylinder of water?
Jim Baumgart
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